changed yacas path to always use src/yacas and --rootdir scripts/ rather than systemwide yacas (which may not be there)
changed yacas path to always use src/yacas and --rootdir scripts/ rather
than systemwide yacas (which may not be there)

grzegorzmazur/yacas,grzegorzmazur/yacas,qwert2003/yacas,grzegorzmazur/yacas,martanoga/yacas,martanoga/yacas,grzegorzmazur/yacas,MateuszSnamina/yacas,qwert2003/yacas,martanoga/yacas,MateuszSnamina/yacas,grzegorzmazur/yacas,tomaszkrysiuk/yacas,MateuszSnamina/yacas,tomaszkrysiuk/yacas,qwert2003/yacas,MateuszSnamina/yacas,qwert2003/yacas,tomaszkrysiuk/yacas,qwert2003/yacas,tomaszkrysiuk/yacas,qwert2003/yacas,grzegorzmazur/yacas,MateuszSnamina/yacas,martanoga/yacas,tomaszkrysiuk/yacas,martanoga/yacas,MateuszSnamina/yacas,grzegorzmazur/yacas,tomaszkrysiuk/yacas,tomaszkrysiuk/yacas,martanoga/yacas,qwert2003/yacas,MateuszSnamina/yacas,martanoga/yacas